netdev - Question about QoS hardware offload

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Message-ID: <CABJS2x78hO71EAUpe+4xNUb8b5BTypOSOfd4Ati+r6PTq3sopA@mail.gmail.com>
Date:   Wed, 15 Dec 2021 23:08:10 +0530
From:   Naveen Mamindlapalli <naveen130617.lkml@...il.com>
To:     lartc@...r.kernel.org, netdev@...r.kernel.org
Cc:     jhs@...atatu.com, maximmi@...dia.com
Subject: Question about QoS hardware offload

Hi,

Our NIC hardware provides a hierarchical QoS tree for each physical
link with strict
priority and DRR scheduling & also supports traffic shaping at each
level. I'm curious what the closest qdisc that supports the above
functionalities for offloading to hardware. I looked into htb/drr/prio
qdiscs, but each qdisc supports a subset of the functionality enabled
by our hardware.

As per my understanding, The HTB hardware offload is used for shaping
rather than scheduling (strict priority/DRR).

The PRIO qdisc seems to support strict priority but not DRR. Similarly
DRR doesn't support strict priority.

Please advise on how to effectively offload all the features.

Is the ETS - Enhanced Transmission Selection scheduler a better fit if
we simply need to offload scheduling with strict priority and DRR?

Thanks,
Naveen